Rylan, born with an addiction to meth and a family history of bipolar disorder, has become "terrifying" to Kim and her ex-husband Ryan, the tearful mom says. The show didn't disclose their last names or hometown.

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The parents showed video of the boy threatening to stab them and screaming bloody murder when his mom and another woman tried to calm him down during the segment Tuesday's episode of "Dr. Phil."

Rylan has an 'obsession with knives,' his mom told Dr. Phil. (Dr. Phil)

Another clip shows him warning of a brutal stabbing if his parents "take those big knives away from me." The kid slams his fists down on a couch cushion in a horrifying gouging simulation.

"That's what I'm going to do to you," he says.

Rylan's parents said they realized something was amiss when Rylan, at age 18 months, held his breath until he passed out out. He jammed about 10 knives into a watermelon when he was 3 years old. At 6, Rylan locked himself in the family's bathrooms and lopped off his fingertips with his older brother's shaving razor because an imaginary robot named "Bleeder" told him to do it, Kim said.

Rylan's father Ryan holds the boy in a 'therapeutic hold' to try to calm him down. (Dr. Phil)

"My biggest fear is that we're raising a school shooter, a mass murderer, a serial killer ... we've placed Rylan in six hospitals," Kim said, adding that a therapist compared the kid to serial killer Ted Bundy.

"I want to live with Rylan, but to have him at home is too terrifying," she added.

Rylan's father, who said the boy "curses nonstop," once discovered that Rylan had stashed sharp objects in a toilet at the family home. He said he had learned to restrain his child in a "therapeutic hold" to subdue him.